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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
C. Location of Heat Sources: An employee who works in an environment which is generally cool, but in close proximity to hot objects may be at risk for heat stress. Sources of heat must be identified and their location in relation to the employee considered when assessing potential for heat stress.